CN106786657A - For the Power Quality Comprehensive Treatment Device of power distribution network - Google Patents
For the Power Quality Comprehensive Treatment Device of power distribution network Download PDFInfo
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- CN106786657A CN106786657A CN201710024791.5A CN201710024791A CN106786657A CN 106786657 A CN106786657 A CN 106786657A CN 201710024791 A CN201710024791 A CN 201710024791A CN 106786657 A CN106786657 A CN 106786657A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention belongs to the technical field of the Power quality management of power system, more particularly to a kind of Power Quality Comprehensive Treatment Device；The technical problem of solution is：Offer is a kind of to integrate the Power Quality Comprehensive Treatment Device for power distribution network that reactive-load compensation, harmonic compensation, imbalance compensation and low-voltage compensate this several function；The technical scheme for using for：For the Power Quality Comprehensive Treatment Device of power distribution network, it is serially connected between power supply U1 and load FZ1, the Power Quality Comprehensive Treatment Device includes：Main circuit and control circuit, main circuit include：Transformer TR, filtering unit LC, filter reactor La, the first three-level inverter CON1 and the second three-level inverter CON2；The present invention is applied to power system.
Description
Technical field
Controlled the invention belongs to the technical field of the Power quality management of power system, more particularly to a kind of comprehensive power quality
Reason device.
Background technology
Now, the low-voltage network scale in China rural area, line length and 400V/220V low-voltage circuits be all with extensively
Large user's zero distance is contacted.As the development and household electrical appliances of rural economy are gone to the countryside the development of policy, various high-power household electrical appliance go out
In the family of present peasant, the power consumption in rural area increases sharply.
Often there is following operation conditions in rural area dispatching area：The agricultural production of countryside and peasantry work and mobility, cause agriculture
The big load fluctuation of village's power network；Terminal voltage away from transformer station, heavy load is relatively low, voltage-regulation, voltage mistake when transformer station
Gao Shi, light load is too high, will burning apparatus；Some regions have many small hydropower stations, and rainy season 400V line voltage distribution is too high, seriously
Phase voltage can reach 295v, this may result in user equipment damage；In low voltage three-phase four-wire system electric power system, due to
The single-phase load of user or single-phase and three-phase load and load configuration, the time of size and power are different, therefore, three-phase is born
Carry unbalanced situation to exist, improve the influence of the power attenuation of transformer, distribution transformer can be burnt when serious；It is non-linear negative
The rapid growth of load causes that harmonic problem occurs, and this safe operation to low voltage electric network reactive power compensator constitutes huge prestige
The side of body.
With the appearance of above-mentioned operation conditions, low-voltage network has low power factor, three-phase imbalance, voltage and does not conform to
The problems such as lattice, harmonic wave, have impact on power supply quality.At present, general management apparatus function is single, and volume is big, and degree of regulation is poor, it is impossible to
Solve power quality problem, influence equipment security, be all low-voltage active electric power filter is employed alone administer harmonic wave,
Reactive-load compensation is administered using low pressure static reacance generator, low-voltage is administered using low-voltage controlling device, lack one kind
It is comprehensive to play the integration unit for administering harmonic wave, low power factor, three-phase imbalance and low-voltage.
The content of the invention
The present invention overcomes the shortcomings of that prior art is present, and technical problem to be solved is：A kind of reactive-load compensation of collection of offer,
Harmonic compensation, imbalance compensation and low-voltage compensate this several function and are controlled in the comprehensive power quality for power distribution network of one
Reason device.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：For the comprehensive power quality of power distribution network
Controlling device, is serially connected between power supply U1 and load FZ1, and the Power Quality Comprehensive Treatment Device includes：Main circuit and control
Circuit, the main circuit includes：Transformer TR, filtering unit LC, filter reactor La, the first three-level inverter CON1 and
Two three-level inverter CON2；The first winding of the transformer TR is serially connected between the power supply U1 and the load FZ1, institute
State the first three-level inverter CON1 and access electricity by being connected after the Secondary Winding of the filtering unit LC and the transformer TR
In net, the second three-level inverter CON2 by after the filter reactor La with the load FZ1 and connect, described first
The control signal input of the control signal input of three-level inverter CON1 and the second three-level inverter CON2 point
Control signal output not with the control circuit is electrically connected.
Preferably, the control circuit includes：Collecting unit, pretreatment unit and main control unit, the collecting unit bag
Include：Power grid voltage detection circuit, load circuit detection circuit, output circuit detection circuit and direct current bus voltage detecting circuit,
The pretreatment unit includes：Modulate circuit and analog-digital converter, the main control unit include：Dsp chip, fpga chip, PWM
Pulse blocking module and PWM output modules；The output end of the power grid voltage detection circuit, the load circuit detect circuit
Output end, the output circuit detection circuit output end and the direct current bus voltage detecting circuit output end respectively with institute
The input electrical connection of modulate circuit is stated, the output end of the modulate circuit electrically connects with the input of the analog-digital converter
Connect, the input of the output end of the analog-digital converter and the dsp chip is electrically connected, the output end of the dsp chip with
The input electrical connection of the fpga chip, the input of the output end of the fpga chip and the pwm pulse lockout module
End electrical connection, the output end of the pwm pulse lockout module is electrically connected with the input of the PWM output modules.
Preferably, the control circuit also includes：Zero-crossing detection circuit and protection circuit, the zero-crossing detection circuit
The input of output end and the dsp chip be electrically connected, the output end of the protection circuit and pwm pulse block mould
The input electrical connection of block.
Preferably, the Power Quality Comprehensive Treatment Device also includes：Bypass circuit, the bypass circuit includes：First
Contactor KM1, second contactor KM2 and the 3rd contactor KM3, the normally opened contact of the first contactor KM1 are serially connected in described
Between the first winding of power supply U1 and the transformer TR, the normally opened contact of the second contactor KM2 is serially connected in the filtering
Between reactor La and the load FZ1, the normally opened contact of the 3rd contactor KM3 is serially connected in the power supply U1 and described negative
Between load FZ1.
Preferably, the Power Quality Comprehensive Treatment Device also includes：Circuit breaker Q F1, the circuit breaker Q F1 are serially connected in institute
State between the normally opened contact of power supply U1 and the 3rd contactor KM3.
Preferably, the Power Quality Comprehensive Treatment Device also includes：DC capacitor CL, the DC capacitor CL are attempted by
The public direct-current end of the first three-level inverter CON1 and the second three-level inverter CON2.
Preferably, the DC capacitor CL includes：Electric capacity CL1 and electric capacity CL2, the electric capacity CL1 and the electric capacity CL2 go here and there
It is linked togather, and line between the electric capacity CL1 and the electric capacity CL2 is electrically connected with the zero line of the power supply U1.
Preferably, the transformer TR includes：Single-phase transformer TR1, single-phase transformer TR2 and single-phase transformer TR3, institute
Stating filtering unit LC includes：Inductance L1, inductance L2, inductance L3, electric capacity C1, electric capacity C2 and electric capacity C3, the filter reactor La
Including：Inductance L4, inductance L5, inductance L6, inductance L7, inductance L8, inductance L9, electric capacity C4, electric capacity C5 and electric capacity C6, described first
Three-level inverter CON1 includes：Three-level inverter circuit T1, three-level inverter circuit T2 and three-level inverter circuit T3, it is described
Second three-level inverter CON2 includes：Three-level inverter circuit T4, three-level inverter circuit T5 and three-level inverter circuit T6,
Three-level inverter circuit T1, T2, the structure of T3, T4, T5, T6 are identical, and the structure of the three-level inverter circuit T1 is：Bag
Include：Four IGBT units, are respectively connected with a diode between the collector and emitter of each IGBT unit, an IGBT is mono-
The emitter stage of first Q1 is connected with the colelctor electrode of the 2nd IGBT units Q2 and the colelctor electrode of the 3rd IGBT units Q3 respectively, the 3rd IGBT
The emitter stage of unit Q3 is connected with the emitter stage of the 4th IGBT units Q4；Three phase mains U1 passes sequentially through circuit breaker Q F1, first connects
The normally opened contact of tentaculum KM1 and the normally opened contact of second contactor KM2 are connected with the load FZ1, the first contactor KM1
Normally opened contact and the second contactor KM2 normally opened contact two ends and be connected to the normally opened contact of the 3rd contactor KM3, institute
State single-phase transformer TR1 first winding be serially connected in the first contactor KM1 normally opened contact and second contactor KM2 it is normal
Open on the A phase lines between contact, the first winding of the single-phase transformer TR2 is serially connected in the normal of the first contactor KM1
Open on the B phase lines between the normally opened contact of contact and second contactor KM2, the first winding string of the single-phase transformer TR3
It is connected on the C phase lines between the normally opened contact of the first contactor KM1 and the normally opened contact of second contactor KM2；It is described
One end of the Secondary Winding of single-phase transformer TR1 is connected with the zero line of the power supply U1, the single-phase transformer TR1 it is secondary around
The other end of group concatenate after the inductance L1 with the emitter stage of an IGBT units Q1 in the three-level inverter circuit T1 and the
Line between the colelctor electrode of two IGBT units Q2 is connected, one end and the electricity of the Secondary Winding of the single-phase transformer TR2
The zero line of source U1 is connected, with described three electricity after the other end concatenation inductance L2 of the Secondary Winding of the single-phase transformer TR2
Line in flat inverter circuit T2 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2 is connected, institute
The one end for stating the Secondary Winding of single-phase transformer TR3 is connected with the zero line of the power supply U1, and the single-phase transformer TR3's is secondary
The other end of winding concatenate after the inductance L3 with the emitter stage of an IGBT units Q1 in the three-level inverter circuit T3 and
Line between the colelctor electrode of the 2nd IGBT units Q2 is connected, and the two ends of the Secondary Winding of the single-phase transformer TR1 are simultaneously connected to
Electric capacity C1, the two ends of the Secondary Winding of the single-phase transformer TR2 are simultaneously connected to electric capacity C2, and the single-phase transformer TR3's is secondary
The two ends of winding are simultaneously connected to electric capacity C3；One end of the inductance L7 and the first winding of the single-phase transformer TR1 and described
A phase lines between the normally opened contact of two contactor KM2 are connected, the other end of the inductance L7 be sequentially connected in series the inductance L4 and
With the emitter stage and the current collection of the 2nd IGBT units Q2 of an IGBT units Q1 in the three-level inverter circuit T4 after resistance R1
Line between pole is connected, and the line between one end of the electric capacity C4 and the inductance L7 and the inductance L4 is connected, described
The other end of electric capacity C4 is connected with the zero line of the power supply U1, and the two ends of the resistance R1 are simultaneously connected to switch K1；The inductance L8
One end and the B phase lines between the first winding of the single-phase transformer TR2 and the normally opened contact of the second contactor KM2
It is connected, the other end of the inductance L8 is sequentially connected in series after the inductance L5 and resistance R2 and in the three-level inverter circuit T5 the
Line between the emitter stage of one IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2 is connected, one end of the electric capacity C5 with
Line between the inductance L8 and the inductance L5 is connected, the zero line phase of the other end of the electric capacity C5 and the power supply U1
Connect, the two ends of the resistance R2 are simultaneously connected to switch K2；The first winding of one end of the inductance L9 and the single-phase transformer TR3
And C phase lines between the normally opened contact of the second contactor KM2 are connected, the other end of the inductance L9 is sequentially connected in series described
With the emitter stage and the 2nd IGBT units of an IGBT units Q1 in the three-level inverter circuit T6 after inductance L6 and resistance R3
Line between the colelctor electrode of Q2 is connected, the line phase between one end of the electric capacity C6 and the inductance L9 and the inductance L6
Even, the other end of the electric capacity C6 is connected with the zero line of the power supply U1, and the two ends of the resistance R3 are simultaneously connected to switch K3；It is described
In three-level inverter circuit T1 the colelctor electrode of an IGBT units Q1 respectively with an IGBT in the three-level inverter circuit T2
The colelctor electrode of an IGBT units Q1, tri-level inversion electricity in the colelctor electrode of unit Q1, the three-level inverter circuit T3
The colelctor electrode of an IGBT units Q1 and institute in the colelctor electrode of an IGBT units Q1, the three-level inverter circuit T5 in the T4 of road
The colelctor electrode for stating an IGBT units Q1 in three-level inverter circuit T6 is connected；2nd IGBT in the three-level inverter circuit T1
The emitter stage of unit Q1 is inverse with the emitter stage of the 2nd IGBT units Q2, three level in the three-level inverter circuit T2 respectively
Become the transmitting of the 2nd IGBT units Q2 in emitter stage, the three-level inverter circuit T4 of the 2nd IGBT units Q2 in circuit T3
In pole, the three-level inverter circuit T5 second in the emitter stage and the three-level inverter circuit T6 of the 2nd IGBT units Q2
The emitter stage of IGBT units Q2 is connected；The colelctor electrode of the 4th IGBT units Q4, three electricity in the three-level inverter circuit T1
In flat inverter circuit T2 in the colelctor electrode of the 4th IGBT units Q4, the three-level inverter circuit T3 the 4th IGBT units Q4 collection
In electrode, the three-level inverter circuit T4 the 4th in colelctor electrode, the three-level inverter circuit T5 of the 4th IGBT units Q4
The colelctor electrode of the 4th IGBT units Q4 in the colelctor electrode of IGBT units Q4 and the three-level inverter circuit T6, with the power supply
The zero line of U1 is connected；The hair of the colelctor electrode of an IGBT units Q1 and the 2nd IGBT units Q2 in the three-level inverter circuit T1
Between emitter-base bandgap grading, at least and a DC capacitor CL is connected to, the DC capacitor CL includes the electric capacity CL1 and electric capacity that are cascaded
CL2, the line between the electric capacity CL1 and the electric capacity CL2 is connected with the zero line of the power supply U1；The first contactor
The coil of KM1, the coil of the second contactor KM2, the coil of the 3rd contactor KM3, the switch K1, the switch
The K2 and switch K3, is electrically connected with the control circuit in the control circuit 102；The three-level inverter circuit T1,
The gate pole of all IGBT units in T2, T3, T4, T5, T6, is also electrically connected with the control circuit in the control circuit.
Preferably, the analog-digital converter includes 3 A/D chips, the model AD7656 of the A/D chip.
Preferably, the zero-crossing detection circuit, the modulate circuit, the protection circuit and the analog-digital converter are equal
It is arranged on first circuit board, the dsp chip, the fpga chip, the pwm pulse lockout module and the PWM output
Module is respectively provided with the second circuit board.
The present invention has the advantages that compared with prior art：
1st, the Power Quality Comprehensive Treatment Device in the present invention includes main circuit and control circuit, and main circuit includes transformer
TR, filtering unit LC, filter reactor La, the first three-level inverter CON1 and the second three-level inverter CON2, the one or three
Electrical level inverter CON1 series connection is accessed in power network, and the second three-level inverter CON2 is attempted by load end, the first tri-level inversion
The control signal input of the control signal input of device CON1 and the second three-level inverter CON2 respectively with control circuit
Control signal output is electrically connected；The present invention uses the three-level inverter technology of series connection+parallel connection, by controlling circuit to two
Individual current transformer carries out real-time control, it is possible to achieve the items such as reactive-load compensation, harmonic compensation, imbalance compensation and low-voltage compensation
The regulatory function of the quality of power supply.
2nd, the control circuit in the present invention may include collecting unit, pretreatment unit and main control unit, and collecting unit can be wrapped
Power grid voltage detection circuit, load circuit detection circuit, output circuit detection circuit and direct current bus voltage detecting circuit are included, in advance
Processing unit may include modulate circuit and analog-digital converter, and main control unit may include dsp chip, fpga chip, pwm pulse block
Module and PWM output modules；Main circuit in this programme is completed to power network power quality controlling, and control circuit is mainly realized in real time
Collection, the computing of complex control algorithm and the control of power electronic devices of analog quantity and digital quantity, it is power grid voltage detection circuit, negative
Crossing detector circuit, output circuit detection circuit and dc bus detection circuit is carried in real time to adopt the various signals of power network
Collection, collection signal transmission is processed to modulate circuit, and collection signal after treatment is transmitted further to analog-digital converter, mould
Number converter sends dsp chip to, and dsp chip controls PWM output modules to the one or three according to collection signal by fpga chip
The gate pole of each IGBT in electrical level inverter CON1 and the second three-level inverter CON2 exports different pwm signals, comes
Realize the function of reactive-load compensation, harmonic compensation, imbalance compensation and low-voltage compensation；This programme employs the complete of DSP+FPGA
Digital control approach, improves the real-time of whole device.
3rd, the Power Quality Comprehensive Treatment Device in this programme may also include bypass circuit, and bypass circuit includes the first contact
Device KM1, second contactor KM2 and the 3rd contactor KM3, the normally opened contact of first contactor KM1 are serially connected in power supply U1 and transformation
Between the first winding of device TR, the normally opened contact of second contactor KM2 is serially connected between filter reactor La and load FZ1, the
The normally opened contact of three contactor KM3 is serially connected between power supply U1 and load FZ1；Bypass circuit in this programme can realize that electricity is suitable
Sequence it is controllable, and the device bypassed when device breaks down continued to run with proof load.
Brief description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Figure；
Fig. 2 is the knot of main circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Structure schematic diagram；
Fig. 3 is control circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Structural representation；
Fig. 4 is control circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention two is provided
Structural representation；
Fig. 5 is the power flow chart of the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided；
In figure：101 is main circuit, and 102 is control circuit, and 1021 is collecting unit, and 1022 is pretreatment unit, and 1023 are
Main control unit, 1024 is zero-crossing detection circuit, and 1025 is protection circuit, and 10211 is power grid voltage detection circuit, and 10212 are
Load circuit detects circuit, and 10213 is that output circuit detects circuit, and 10214 is direct current bus voltage detecting circuit, and 10221 are
Modulate circuit, 10222 is analog-digital converter, and 10231 is dsp chip, and 10232 is fpga chip, and 10233 block for pwm pulse
Module, 10234 is PWM output modules.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the invention, rather than whole embodiments；Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Figure, as shown in figure 1, for the Power Quality Comprehensive Treatment Device of power distribution network, be serially connected between power supply U1 and load FZ1, it is described
Power Quality Comprehensive Treatment Device includes：Main circuit 101 and control circuit 102, the main circuit 101 include：Transformer TR, filter
Ripple component LC, filter reactor La, the first three-level inverter CON1 and the second three-level inverter CON2；The transformer TR
First winding be serially connected between the power supply U1 and the load FZ1, the first three-level inverter CON1 is by described
Connected after the Secondary Winding of filtering unit LC and the transformer TR in access power network, the second three-level inverter CON2 is passed through
Cross after the filter reactor La with the load FZ1 and connect, the control signal input of the first three-level inverter CON1
Control signal of the control signal input of end and the second three-level inverter CON2 respectively with the control circuit 102 is defeated
Go out end electrical connection.
Specifically, the power supply U1 can be the AC network of three-phase four-wire system, and rated voltage is 380V, and frequency is 50Hz,
Scope range of the fluctuation of voltage is -40%~+20%.
Specifically, the transformer TR mainly can be made up of three independent single-phase transformers, because it is serially connected in exchange
Between power network and load, therefore alternatively referred to as coupling transformer.
Specifically, for the Power Quality Comprehensive Treatment Device in the present embodiment, various load characteristics can be adapted to, such as
Linearly, it is non-linear, uneven etc..
Further, the Power Quality Comprehensive Treatment Device may also include：Bypass circuit, the bypass circuit includes：
First contactor KM1, second contactor KM2 and the 3rd contactor KM3, the normally opened contact of the first contactor KM1 are serially connected in
Between the first winding of the power supply U1 and the transformer TR, the normally opened contact of the second contactor KM2 is serially connected in described
Between filter reactor La and the load FZ1, the normally opened contact of the 3rd contactor KM3 is serially connected in the power supply U1 and institute
State load FZ1 between.
Further, the Power Quality Comprehensive Treatment Device may also include：Circuit breaker Q F1, the circuit breaker Q F1 concatenations
Between the normally opened contact of the power supply U1 and the 3rd contactor KM3.
Specifically, the circuit breaker Q F1 can be only to limit breaker.
Further, the Power Quality Comprehensive Treatment Device may also include：DC capacitor CL, the DC capacitor CL is simultaneously
It is connected on the public direct-current end of the first three-level inverter CON1 and the second three-level inverter CON2.
Further, the DC capacitor CL may include：Electric capacity CL1 and electric capacity CL2, the electric capacity CL1 and the electricity
Hold CL2 to be cascaded, and line between the electric capacity CL1 and the electric capacity CL2 electrically connects with the zero line of the power supply U1
Connect.
Specifically, the quantity of the DC capacitor CL can be adjusted according to the actual requirements.
The present embodiment is entered using the three-level inverter technology of series connection+parallel connection by controlling two current transformers of circuit 102 pair
Row real-time control, it is possible to achieve every quality of power supply such as reactive-load compensation, harmonic compensation, imbalance compensation and low-voltage compensation
Regulatory function.
Additionally, the bypass circuit in the present embodiment can realize the controllable of electric sequence, and when device breaks down by
Fall the device and continued to run with proof load in road.
Fig. 2 is the knot of main circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Structure schematic diagram, as shown in Fig. 2 the transformer TR includes：Single-phase transformer TR1, single-phase transformer TR2 and single-phase transformer
TR3, the filtering unit LC includes：Inductance L1, inductance L2, inductance L3, electric capacity C1, electric capacity C2 and electric capacity C3, the filtered electrical
Anti- device La includes：Inductance L4, inductance L5, inductance L6, inductance L7, inductance L8, inductance L9, electric capacity C4, electric capacity C5 and electric capacity C6, institute
Stating the first three-level inverter CON1 includes：Three-level inverter circuit T1, three-level inverter circuit T2 and three-level inverter circuit
T3, the second three-level inverter CON2 includes：Three-level inverter circuit T4, three-level inverter circuit T5 and tri-level inversion
Circuit T6, three-level inverter circuit T1, T2, the structure of T3, T4, T5, T6 are identical, the knot of the three-level inverter circuit T1
Structure is：Including：Four IGBT units, are respectively connected with a diode between the collector and emitter of each IGBT unit, the
The emitter stage of one IGBT units Q1 is connected with the colelctor electrode of the 2nd IGBT units Q2 and the colelctor electrode of the 3rd IGBT units Q3 respectively,
The emitter stage of the 3rd IGBT units Q3 is connected with the emitter stage of the 4th IGBT units Q4.
Three phase mains U1 passes sequentially through circuit breaker Q F1, the normally opened contact of first contactor KM1 and second contactor KM2's
Normally opened contact is connected with the load FZ1, and the normally opened contact of the first contactor KM1 and the second contactor KM2's is normal
Open the two ends of contact and be connected to the normally opened contact of the 3rd contactor KM3, the first winding of the single-phase transformer TR1 is serially connected in institute
State on the A phase lines between the normally opened contact of first contactor KM1 and the normally opened contact of second contactor KM2, the single-phase change
The first winding of depressor TR2 be serially connected in the first contactor KM1 normally opened contact and second contactor KM2 normally opened contact it
Between B phase lines on, the first winding of the single-phase transformer TR3 be serially connected in the first contactor KM1 normally opened contact and
On C phase lines between the normally opened contact of second contactor KM2；One end of the Secondary Winding of the single-phase transformer TR1 and institute
The zero line for stating power supply U1 is connected, the other end of the Secondary Winding of the single-phase transformer TR1 concatenate after the inductance L1 with it is described
Line phase in three-level inverter circuit T1 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2
Even, one end of the Secondary Winding of the single-phase transformer TR2 is connected with the zero line of the power supply U1, the single-phase transformer TR2
The other end of Secondary Winding concatenate hair after the inductance L2 with an IGBT units Q1 in the three-level inverter circuit T2
Line between the colelctor electrode of emitter-base bandgap grading and the 2nd IGBT units Q2 is connected, one end of the Secondary Winding of the single-phase transformer TR3
Zero line with the power supply U1 is connected, the other end of the Secondary Winding of the single-phase transformer TR3 concatenate after the inductance L3 with
Company in the three-level inverter circuit T3 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2
Line is connected, and the two ends of the Secondary Winding of the single-phase transformer TR1 are simultaneously connected to electric capacity C1, and the single-phase transformer TR2's is secondary
The two ends of winding are simultaneously connected to electric capacity C2, and the two ends of the Secondary Winding of the single-phase transformer TR3 are simultaneously connected to electric capacity C3.
The first winding of one end of the inductance L7 and the single-phase transformer TR1 and the second contactor KM2's is normal
A phase lines between contact are opened to be connected, the other end of the inductance L7 be sequentially connected in series after the inductance L4 and resistance R1 with it is described
Line phase in three-level inverter circuit T4 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2
Even, the line between one end of the electric capacity C4 and the inductance L7 and the inductance L4 is connected, the other end of the electric capacity C4
Zero line with the power supply U1 is connected, and the two ends of the resistance R1 are simultaneously connected to switch K1；One end of the inductance L8 and the list
B phase lines between the normally opened contact of the first winding of phase transformer TR2 and the second contactor KM2 are connected, the inductance
The other end of L8 is sequentially connected in series after the inductance L5 and resistance R2 and an IGBT units Q1 in the three-level inverter circuit T5
Emitter stage and the colelctor electrode of the 2nd IGBT units Q2 between line be connected, one end of the electric capacity C5 and the inductance L8 and
Line between the inductance L5 is connected, and the other end of the electric capacity C5 is connected with the zero line of the power supply U1, the resistance R2
Two ends and be connected to switch K2；One end of the inductance L9 connects with the first winding of the single-phase transformer TR3 and described second
C phase lines between the normally opened contact of tentaculum KM2 are connected, and the other end of the inductance L9 is sequentially connected in series the inductance L6 and resistance
After R3 with the colelctor electrode of the emitter stage of an IGBT units Q1 in the three-level inverter circuit T6 and the 2nd IGBT units Q2 it
Between line be connected, the line between one end of the electric capacity C6 and the inductance L9 and the inductance L6 is connected, the electric capacity
The other end of C6 is connected with the zero line of the power supply U1, and the two ends of the resistance R3 are simultaneously connected to switch K3.
In the three-level inverter circuit T1 colelctor electrode of an IGBT units Q1 respectively with the three-level inverter circuit
It is the colelctor electrode of an IGBT units Q1 in the colelctor electrode of an IGBT units Q1, the three-level inverter circuit T3 in T2, described
An IGBT units Q1 in the colelctor electrode of an IGBT units Q1, the three-level inverter circuit T5 in three-level inverter circuit T4
Colelctor electrode be connected with the colelctor electrode of an IGBT units Q1 in the three-level inverter circuit T6；The three-level inverter circuit
In T1 the emitter stage of the 2nd IGBT units Q2 respectively with the emitter stage of the 2nd IGBT units Q2 in the three-level inverter circuit T2,
The 2nd IGBT is mono- in the emitter stage of the 2nd IGBT units Q2, the three-level inverter circuit T4 in the three-level inverter circuit T3
The emitter stage and the three-level inverter circuit of the 2nd IGBT units Q2 in the emitter stage of first Q2, the three-level inverter circuit T5
The emitter stage of the 2nd IGBT units Q2 is connected in T6；The colelctor electrode of the 4th IGBT units Q4 in the three-level inverter circuit T1,
The 4th IGBT is mono- in the colelctor electrode of the 4th IGBT units Q4, the three-level inverter circuit T3 in the three-level inverter circuit T2
Colelctor electrode, the three-level inverter circuit of the 4th IGBT units Q4 in the colelctor electrode of first Q4, the three-level inverter circuit T4
In T5 in the colelctor electrode and the three-level inverter circuit T6 of the 4th IGBT units Q4 the 4th IGBT units Q4 colelctor electrode, with
The zero line of the power supply U1 is connected；An IGBT in the three-level inverter circuit T1 (or T2 or T3 or T4 or T5 or T6)
Between the emitter stage of the colelctor electrode of unit Q1 and the 2nd IGBT units Q2, at least and a DC capacitor CL, the direct current are connected to
Electric capacity CL includes the electric capacity CL1 and electric capacity CL2 that are cascaded, line and institute between the electric capacity CL1 and the electric capacity CL2
The zero line for stating power supply U1 is connected.
The coil of the first contactor KM1, the coil of the second contactor KM2, the line of the 3rd contactor KM3
Circle, the switch K1, the switch K2 and switch K3, are electrically connected with the control circuit in the control circuit 102；
The gate pole of all IGBT units in three-level inverter circuit T1, T2, T3, T4, T5, T6, also with the control circuit
Control circuit electrical connection in 102.
Fig. 3 is control circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided
Structural representation, as shown in figure 3, the control circuit 102 may include：Collecting unit 1021, pretreatment unit 1022 and master control
Unit 1023, the collecting unit 1021 may include：Power grid voltage detection circuit 10211, load circuit detection circuit 10212,
Output circuit detects circuit 10213 and direct current bus voltage detecting circuit 10214, and the pretreatment unit 1022 may include：Adjust
Reason circuit 10221 and analog-digital converter 10222, the main control unit 1023 may include：Dsp chip 10231, fpga chip
10232nd, pwm pulse lockout module 10233 and PWM output modules 10234.
The output end of the power grid voltage detection circuit 10211, the load circuit detection circuit 10212 output end,
The output end of the output circuit detection circuit 10213 and the output end difference of the direct current bus voltage detecting circuit 10214
It is electrically connected with the input of the modulate circuit 10221, the output end of the modulate circuit 10221 and the analog-digital converter
10222 input electrical connection, the output end of the analog-digital converter 10222 is electric with the input of the dsp chip 10231
Gas is connected, and the output end of the dsp chip 10231 is electrically connected with the input of the fpga chip 10232, the FPGA cores
The output end of piece 10232 is electrically connected with the input of the pwm pulse lockout module 10233, the pwm pulse lockout module
10233 output end is electrically connected with the input of the PWM output modules 10234.
Main control part in control circuit 102 is the important component of whole device, decides the normal operation of device
And functional realiey.Requirement in view of whole device to real-time is higher, final to use with reference to numerically controlled Some features
The all-digitized demodulator scheme of DSP+FPGA, wherein, dsp chip 10231 can be TMS320F28335 chips, mainly realize fundamental wave electricity
The functions such as net voltage lock phase, instruction current computing, DC voltage control, system overvoltage, overcurrent protection；Fpga chip 10232
Can be EP2C8Q208C8N, mainly realize the generation of pwm signal；In order to ensure the precision of sampling, the inside of DSP can not be used
AD, and AD7656 chips can be selected, AD7656 chips are the A/D chips of 16, there is 6 sampling channels, Parallel transformation,
Input reference signal is ± 10V.Because the signal for needing sampling includes three-phase power grid voltage usa、usb、usc, three phase network electric current
isa、isb、isc, device three-phase output voltage uca、ucb、ucc, output current ica、icb、icc, load current ila、ilb、ilc, series connection
Output current i1a、i1b、i1cWith DC capacitor voltage totally 18 road signal, therefore 3 AD7656 are needed in the present embodiment altogether.
Main circuit 101 in the present embodiment is completed to power network power quality controlling, and control circuit 102 mainly realizes real-time mould
Collection, the computing of complex control algorithm and the control of power electronic devices of analog quantity and digital quantity, power grid voltage detection circuit
10211st, load circuit detection circuit 10212, output circuit detection circuit 10213 and dc bus detection circuit 10214 are real-time
Various signals to power network are acquired, and collection signal transmission are processed to modulate circuit 10221, adopting after treatment
Collection signal is transmitted further to analog-digital converter 10222, and analog-digital converter 10222 sends dsp chip 10231, dsp chip 10231 to
PWM output modules 10234 are controlled to the first three-level inverter CON1 and second by fpga chip 10232 according to collection signal
The gate pole of each IGBT in three-level inverter CON2 exports different pwm signals to realize that reactive-load compensation, harmonic wave are mended
Repay, imbalance compensation and low-voltage compensation function；This programme employs the all-digitized demodulator mode of DSP+FPGA, improves
The real-time of whole device.
Fig. 4 is control circuit in the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention two is provided
Structural representation, as shown in figure 4, on the basis of embodiment one, the control circuit 102 may also include：Zero-crossing examination electricity
Road 1024 and protection circuit 1025, the input of the output end of the zero-crossing detection circuit 1024 and the dsp chip 10231
Electrical connection, the output end of the protection circuit 1025 is electrically connected with the input of the pwm pulse lockout module 10233.
In the present embodiment, the input signal of the zero-crossing detection circuit 1024 and the protection circuit 1025 comes from adopts
The three-phase power grid voltage and electric current of collection.
Specifically, the zero-crossing detection circuit 1024, the modulate circuit 10221, the protection circuit 1025 and institute
Analog-digital converter 10222 is stated to may be provided on an AD plate, it is the dsp chip 10231, the fpga chip 10232, described
Pwm pulse lockout module 10233 and the PWM output modules 10234 may be provided on a FPGA+DSP control panel.
Fig. 5 is the power flow chart of the Power Quality Comprehensive Treatment Device for power distribution network that the embodiment of the present invention one is provided,
As shown in figure 5, giving the single-phase power flow graph of device, the capacitor equivalent at dc bus end is single electric capacity Cdc, this external circuit
In have ignored line impedance, coupling transformer TR is considered as a preferable transformer.Load current iLWith nonlinear characteristic, by
Fundamental active current iLP, fundamental reactive current iLQHarmonic electric current iLhThree parts constitute, iL=iLP+iLQ+iLh.To two unsteady flows
Device carries out real-time control, it is possible to achieve foregoing every quality of power supply regulatory function.Using Direct control strategy, to series converter
(i.e. the first three-level inverter CON1) and parallel converters (i.e. the second three-level inverter CON2) carry out independent control respectively
System, selects optimal control strategy to realize optimal control effect beneficial to each current transformer.It is fundamental wave that series converter is controlled
Sinusoidal current source, its output current i1It is sine wave, the Linear Amplifer effect of coupled transformer TR, therefore power network input current
isControlled is sine.If control causes isWith power network input voltage vsSame phase, then power network input power factor be 1, make power network only to
Load active power of output Ps, and reactive power Qs=0, it is clear that now series converter is treatment active-power P1, and it is idle
Power Q1=0.Parallel converters are controlled for specified sinusoidal voltage source, it is the specified electricity of sine wave that it can be made to export to the voltage of load
Pressure vRAnd with power network input voltage fundamental wave vs1Same phase, so as to ensure that in power network input voltage there is harmonic wave, non-specified, asymmetric feelings
The requirement of portvoltage is loaded under condition.
Due to power network input current isIt is sine wave under the control of series converter, therefore forces parallel converters to negative
Carry output current i3=iLQ+iLh+(iLP-is), wherein iLQCompensation load reactive current, iLhCompensation load harmonic current, and load
Watt current iLPThen by AC network (is) and parallel converters (i2d) common offer, i2d=iLP-is, namely unsteady flow in parallel
Device exports the reactive power Q for compensating load reactive power2Outward, output par, c active-power P is gone back2.And due to parallel converters
Controlled is specified fundamental wave sinusoidal voltage source, load voltage vLAlways maintain specified sine wave constant, therefore force series converter
The voltage Δ v of coupled transformer output is made up of two parts, Δ v=Δs v1+Δvh, wherein Δ vhIt is harmonic compensation voltage, it
With the harmonic voltage v in AC powershIt is equal in magnitude, Δ vh=vsh, but in the opposite direction；Δv1It is fundamental voltage compensation rate, uses
In the fundamental wave v of compensation supply voltages1With load voltage rated value vRDeviation, so series converter provide offset voltage Δ
V had both counteracted supply voltage vsIn harmonic wave vsh, fundamental voltage v is compensated agains1, make load voltage vLAs with power network fundamental voltage
vs1With the sine wave rated voltage v of phaseR。
Just because of series converter and the collective effect of parallel converters so that loading non-linear, power network input electricity
Pressure is higher or lower than rated value vRAnd during containing harmonic voltage, load voltage vLCompensate with power network input voltage with the specified of phase
Sinusoidal voltage vR, while AC network is only input into fundamental active current is, power network input power factor is 1.
On low-voltage compensation policy, when being chosen to power distribution network low-voltage compensation policy, general main consideration two
Individual aspect：One be voltage compensation ability, i.e., under conditions of identical DC voltage, the offset voltage of amplitude peak is asked
Topic；Two is energy compensating ability, i.e., under conditions of identical DC voltage and storage capacitor, obtain the compensation of Voltage Drop most long
Time.At present frequently with defect voltage compensation method, in-phase voltage penalty method and minimum three kinds of voltage compensations of active injecting compensating method
Strategy is compensated to voltage.Wherein, defect voltage compensation method, is voltage phasor before falling as reference quantity, injection
Offset voltage makes the amplitude and phase of load side voltage phasor not change.This algorithm is most simple, and from load
From the point of view of angle, because the amplitude and phase of load side voltage phasor do not change, therefore the effect of compensation is best.
In sum, the solution of the present invention has advantages below, with prominent substantive distinguishing features and significant progress：It is main
Loop comprehensively carries out reactive-load compensation, compensation harmonic, imbalance compensation and compensation low-voltage using series connection+parallel way；Lead back
Device excision automatic in plant failure can not be influenceed rear end to power by road with bypass functionality；Coupling unit is filtered using LCT types
Ripple device structure preferably reduces switch subharmonic inverter section and improves switching frequency and reality using bidirectional three-level inverter circuit
The six direction flowing of existing power.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. it is used for the Power Quality Comprehensive Treatment Device of power distribution network, is serially connected between power supply U1 and load FZ1, it is characterised in that：
The Power Quality Comprehensive Treatment Device includes：Main circuit (101) and control circuit (102), the main circuit (101) include：
Transformer TR, filtering unit LC, filter reactor La, the first three-level inverter CON1 and the second three-level inverter CON2；
The first winding of the transformer TR is serially connected between the power supply U1 and the load FZ1, first three-level inverter
During CON1 accesses power network by being connected after the Secondary Winding of the filtering unit LC and the transformer TR, the two or three level
Inverter CON2 by after the filter reactor La with the load FZ1 and connect, the first three-level inverter CON1's
The control signal input of control signal input and the second three-level inverter CON2 respectively with the control circuit
(102) control signal output electrical connection.
2. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 1, it is characterised in that：The control
Circuit (102) includes：Collecting unit (1021), pretreatment unit (1022) and main control unit (1023), the collecting unit
(1021) include：Power grid voltage detection circuit (10211), load circuit detect circuit (10212), output circuit detection circuit
(10213) and direct current bus voltage detecting circuit (10214), the pretreatment unit (1022) includes：Modulate circuit (10221)
With analog-digital converter (10222), the main control unit (1023) includes：Dsp chip (10231), fpga chip (10232), PWM
Pulse blocking module (10233) and PWM output modules (10234)；
The output end of the power grid voltage detection circuit (10211), the output end of load circuit detection circuit (10212),
The output end of output circuit detection circuit (10213) and the output end of the direct current bus voltage detecting circuit (10214)
The input with the modulate circuit (10221) is electrically connected respectively, the output end and the mould of the modulate circuit (10221)
The input electrical connection of number converter (10222), the output end and the dsp chip of the analog-digital converter (10222)
(10231) input electrical connection, the output end of the dsp chip (10231) and the input of the fpga chip (10232)
End electrical connection, the output end of the fpga chip (10232) is electric with the input of the pwm pulse lockout module (10233)
Gas is connected, and the output end of the pwm pulse lockout module (10233) is electric with the input of the PWM output modules (10234)
Connection.
3. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 2, it is characterised in that：The control
Circuit (102) also includes：Zero-crossing detection circuit (1024) and protection circuit (1025), the zero-crossing detection circuit (1024)
The input of output end and the dsp chip (10231) be electrically connected, the output end of the protection circuit (1025) with it is described
The input electrical connection of pwm pulse lockout module (10233).
4. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 1, it is characterised in that：The electric energy
Comprehensive quality control device also includes：Bypass circuit, the bypass circuit includes：First contactor KM1, second contactor KM2
With the 3rd contactor KM3, the normally opened contact of the first contactor KM1 is serially connected in the one of the power supply U1 and the transformer TR
Between secondary winding, the normally opened contact of the second contactor KM2 be serially connected in the filter reactor La and load FZ1 it
Between, the normally opened contact of the 3rd contactor KM3 is serially connected between the power supply U1 and the load FZ1.
5. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 4, it is characterised in that：The electric energy
Comprehensive quality control device also includes：Circuit breaker Q F1, the circuit breaker Q F1 are serially connected in the power supply U1 and the 3rd contact
Between the normally opened contact of device KM3.
6. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 1, it is characterised in that：The electric energy
Comprehensive quality control device also includes：DC capacitor CL, the DC capacitor CL are attempted by first three-level inverter
The public direct-current end of CON1 and the second three-level inverter CON2.
7. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 6, it is characterised in that：The direct current
Electric capacity CL includes：Electric capacity CL1 and electric capacity CL2, the electric capacity CL1 and the electric capacity CL2 are cascaded, and the electric capacity CL1
And the line between the electric capacity CL2 is electrically connected with the zero line of the power supply U1.
8. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 1, it is characterised in that：The transformation
Device TR includes：Single-phase transformer TR1, single-phase transformer TR2 and single-phase transformer TR3, the filtering unit LC include：Inductance
L1, inductance L2, inductance L3, electric capacity C1, electric capacity C2 and electric capacity C3, the filter reactor La include：Inductance L4, inductance L5, electricity
Sense L6, inductance L7, inductance L8, inductance L9, electric capacity C4, electric capacity C5 and electric capacity C6, the first three-level inverter CON1 include：
Three-level inverter circuit T1, three-level inverter circuit T2 and three-level inverter circuit T3, the second three-level inverter CON2
Including：Three-level inverter circuit T4, three-level inverter circuit T5 and three-level inverter circuit T6, the three-level inverter circuit
The structure of T1, T2, T3, T4, T5, T6 is identical, and the structure of the three-level inverter circuit T1 is：Including：Four IGBT units, often
Be respectively connected with a diode between the collector and emitter of individual IGBT units, the emitter stage of an IGBT units Q1 respectively with
The colelctor electrode of the 2nd IGBT units Q2 and the colelctor electrode of the 3rd IGBT units Q3 are connected, the emitter stage of the 3rd IGBT units Q3 and the
The emitter stage of four IGBT units Q4 is connected；
Three phase mains U1 passes sequentially through the normally opened of circuit breaker Q F1, the normally opened contact of first contactor KM1 and second contactor KM2
Contact is connected with the load FZ1, and the normally opened contact of the first contactor KM1 and the normally opened of the second contactor KM2 touch
The two ends of point are simultaneously connected to the normally opened contact of the 3rd contactor KM3, and the first winding of the single-phase transformer TR1 is serially connected in described the
On A phase lines between the normally opened contact of one contactor KM1 and the normally opened contact of second contactor KM2, the single-phase transformer
The first winding of TR2 is serially connected between the normally opened contact of the first contactor KM1 and the normally opened contact of second contactor KM2
On B phase lines, the first winding of the single-phase transformer TR3 is serially connected in the normally opened contact and second of the first contactor KM1
On C phase lines between the normally opened contact of contactor KM2；One end of the Secondary Winding of the single-phase transformer TR1 and the electricity
The zero line of source U1 is connected, with described three electricity after the other end concatenation inductance L1 of the Secondary Winding of the single-phase transformer TR1
Line in flat inverter circuit T1 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2 is connected, institute
The one end for stating the Secondary Winding of single-phase transformer TR2 is connected with the zero line of the power supply U1, and the single-phase transformer TR2's is secondary
The other end of winding concatenate after the inductance L2 with the emitter stage of an IGBT units Q1 in the three-level inverter circuit T2 and
Line between the colelctor electrode of the 2nd IGBT units Q2 is connected, one end of the Secondary Winding of the single-phase transformer TR3 with it is described
The zero line of power supply U1 is connected, with described three after the other end concatenation inductance L3 of the Secondary Winding of the single-phase transformer TR3
Line in level inverter circuit T3 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2 is connected,
The two ends of the Secondary Winding of the single-phase transformer TR1 are simultaneously connected to electric capacity C1, and the two of the Secondary Winding of the single-phase transformer TR2
Electric capacity C2 is held and is connected to, the two ends of the Secondary Winding of the single-phase transformer TR3 are simultaneously connected to electric capacity C3；
Touched with the first winding of the single-phase transformer TR1 and the normally opened of the second contactor KM2 one end of the inductance L7
A phase lines between point are connected, and the other end of the inductance L7 is sequentially connected in series after the inductance L4 and resistance R1 and described three electricity
Line in flat inverter circuit T4 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2 is connected, institute
The line stated between one end of electric capacity C4 and the inductance L7 and the inductance L4 is connected, the other end of the electric capacity C4 with it is described
The zero line of power supply U1 is connected, and the two ends of the resistance R1 are simultaneously connected to switch K1；One end of the inductance L8 and the single-phase transformation
B phase lines between the normally opened contact of the first winding of device TR2 and the second contactor KM2 are connected, and the inductance L8's is another
One end is sequentially connected in series after the inductance L5 and resistance R2 the transmitting with an IGBT units Q1 in the three-level inverter circuit T5
Line between the colelctor electrode of pole and the 2nd IGBT units Q2 is connected, one end of the electric capacity C5 and the inductance L8 and the electricity
Line between sense L5 is connected, and the other end of the electric capacity C5 is connected with the zero line of the power supply U1, the two ends of the resistance R2
And it is connected to switch K2；The first winding and the second contactor KM2 of one end of the inductance L9 and the single-phase transformer TR3
Normally opened contact between C phase lines be connected, the other end of the inductance L9 be sequentially connected in series after the inductance L6 and resistance R3 with
Company in the three-level inverter circuit T6 between the emitter stage of an IGBT units Q1 and the colelctor electrode of the 2nd IGBT units Q2
Line is connected, and the line between one end of the electric capacity C6 and the inductance L9 and the inductance L6 is connected, and the electric capacity C6's is another
One end is connected with the zero line of the power supply U1, and the two ends of the resistance R3 are simultaneously connected to switch K3；
In the three-level inverter circuit T1 colelctor electrode of an IGBT units Q1 respectively with the three-level inverter circuit T2 in
The colelctor electrode of an IGBT units Q1, three electricity in colelctor electrode, the three-level inverter circuit T3 of the first IGBT units Q1
In flat inverter circuit T4 in the colelctor electrode of an IGBT units Q1, the three-level inverter circuit T5 IGBT units Q1 collection
Electrode is connected with the colelctor electrode of an IGBT units Q1 in the three-level inverter circuit T6；In the three-level inverter circuit T1
The emitter stage of the 2nd IGBT units Q2 respectively with the emitter stage of the 2nd IGBT units Q2 in the three-level inverter circuit T2, described
2nd IGBT units Q2 in the emitter stage of the 2nd IGBT units Q2, the three-level inverter circuit T4 in three-level inverter circuit T3
Emitter stage, the three-level inverter circuit T5 in the 2nd IGBT units Q2 emitter stage and the three-level inverter circuit T6 in
The emitter stage of the 2nd IGBT units Q2 is connected；It is the colelctor electrode of the 4th IGBT units Q4 in the three-level inverter circuit T1, described
4th IGBT units Q4 in the colelctor electrode of the 4th IGBT units Q4, the three-level inverter circuit T3 in three-level inverter circuit T2
Colelctor electrode, the three-level inverter circuit T4 in the 4th IGBT units Q4 colelctor electrode, the three-level inverter circuit T5 in
The colelctor electrode of the 4th IGBT units Q4 in the colelctor electrode and the three-level inverter circuit T6 of the 4th IGBT units Q4, with it is described
The zero line of power supply U1 is connected；The colelctor electrode and the 2nd IGBT units Q2 of an IGBT units Q1 in the three-level inverter circuit T1
Emitter stage between, at least and be connected to a DC capacitor CL, the DC capacitor CL include the electric capacity CL1 being cascaded and
Electric capacity CL2, the line between the electric capacity CL1 and the electric capacity CL2 is connected with the zero line of the power supply U1；
The coil of the first contactor KM1, the coil of the second contactor KM2, the coil of the 3rd contactor KM3,
The switch K1, the switch K2 and switch K3, are electrically connected with the control circuit in the control circuit 102；Institute
State the gate pole of all IGBT units in three-level inverter circuit T1, T2, T3, T4, T5, T6, also with the control circuit
(102) the control circuit electrical connection in.
9. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 2, it is characterised in that：The modulus
Converter (10222) includes 3 A/D chips, the model AD7656 of the A/D chip.
10. the Power Quality Comprehensive Treatment Device for power distribution network according to claim 2, it is characterised in that：The mistake
Zero-detection circuit (1024), the modulate circuit (10221), the protection circuit (1025) and the analog-digital converter
(10222) it is arranged on first circuit board, the dsp chip (10231), the fpga chip (10232), the PWM arteries and veins
Rush lockout module (10233) and the PWM output modules (10234) are respectively provided with the second circuit board.
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